Question

All are true regarding Japanese encephalitis except ?

• A. Caused by flavivirus
• B. Humans are dead-end hosts
• C. Transmitted by culex
• D. Cattles are amplifier hosts

Answer 1

The Correct Option is D

Except-question, so hunt the single false statement. Build the true picture of Japanese encephalitis: a flavivirus (group B arbovirus), transmitted by Culex tritaeniorhynchus, with pigs as the amplifying host and birds as the natural maintenance hosts, while humans, cattle and horses are dead-end hosts that do not pass the virus on. Now check each option. Flavivirus is correct, Culex transmission is correct, and humans being dead-end hosts is correct, so options 1, 2 and 3 are all true. The amplifier is the pig, which develops high viraemia, not cattle, which are actually dead-end hosts. So the statement that cattle are amplifier hosts is the false one, making option 4 the answer to this except question.